Women's Swiftwick Zero Vibe Small - Purple The Swiftwick Vibe Zero socks provide users with a medium cushioned, moderately compressive sock that adapts to demanding workouts. The socks are constructed with a high Olefin foot bed to optimize moisture management and increase all day comfort. DETAILS: Moderately compressive fit designed to support muscles on uneven terrain Seamless toe box virtually eliminates blisters from seam irritation Y-shaped heel creates a snug fit that moves with the foot Arch band keeps socks in place and provides compressive support